Hello. Built my PC about three weeks ago - MSI GTX 680, i5-2500k, 8GB RAM @ 1600 MHz. I ran Battlefield 3 with no performance issues at all. However, today I've been bothered with rather (seemingly) low FPS. I've checked my ping, it goes from 13 to 17. In more intense scenes (multiplayer), I can already see the lag. Basically, my 680 performs as if it's a 480. I haven't made any changes to my computer. I've tried reinstalling the drivers, but that didn't solve anything. I doubt it's a heat issue since the game was alright even yesterday, and I didn't remove any fans. I also don't think dust would have filled up my computer overnight. What do you think is the problem? Could something happen to my card and should I get a replacement? Could it be a CPU issue instead? Thanks for your answers in advance.